1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright 2002 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 #pragma ident "%Z%%M% %I% %E% SMI"
28
29 /*
30 * valid_srecord.c: to get and check an S-record string from a file
31 * (firmware image to be downloaded to the service processor)
32 */
33
34 #include <stdio.h>
35 #include <string.h>
36
37 #include "adm.h"
38
39
40 static unsigned long
ADM_string_to_long(char * s,int chars)41 ADM_string_to_long(char *s, int chars)
42 {
43 unsigned long val = 0;
44
45 while (chars--) {
46 val = val << 4;
47 if ((*s >= '0') && (*s <= '9'))
48 val += *s - '0';
49 else if ((*s >= 'a') && (*s <= 'f'))
50 val += *s - 'a' + 10;
51 else if ((*s >= 'A') && (*s <= 'F'))
52 val += *s - 'A' + 10;
53 s++;
54 }
55 return (val);
56 }
57
58
59 int
ADM_Valid_srecord(FILE * FilePtr)60 ADM_Valid_srecord(FILE *FilePtr)
61 {
62 static char Line[ADM_LINE_SIZE];
63 char *CurrentChar;
64 int SrecordLength;
65 int Sum;
66
67
68 if (fgets(Line, ADM_LINE_SIZE, FilePtr) == NULL)
69 return (SREC_ERR_LINE_TOO_BIG);
70
71 rewind(FilePtr);
72
73 if (strlen(Line) < 4)
74 return (SREC_ERR_LINE_TOO_SMALL);
75
76 /* Check first two characters for validity */
77 if ((Line[0] != 'S') || (Line[1] < '0') || (Line[1] > '9'))
78 return (SREC_ERR_BAD_HEADER);
79
80 /* Next check the length for validity */
81 SrecordLength = ADM_string_to_long(Line+2, 2);
82 if (SrecordLength > ((strlen(Line) - 4) / 2))
83 return (SREC_ERR_WRONG_LENGTH);
84
85 /* Check the checksum. */
86 CurrentChar = &Line[2]; /* Skip s-record header */
87 SrecordLength += 1; /* Include checksum */
88 Sum = 0;
89 while (SrecordLength--) {
90 Sum += ADM_string_to_long(CurrentChar, 2);
91 CurrentChar += 2;
92 }
93
94 if ((Sum & 0xFF) != 0xFF)
95 return (SREC_ERR_BAD_CRC); /* checksum failed */
96 else
97 return (SREC_OK); /* checksum passed */
98 }
99